ARM: dts: iwg22d-sodimm: sort dt nodes

Improve the layout of r8a7745-iwg22d-sodimm.dts by sorting the
nodes alphabetically.

Signed-off-by: Fabrizio Castro <fabrizio.castro@bp.renesas.com>
Signed-off-by: Chris Paterson <chris.paterson2@renesas.com>
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>